A drunkard, sot, alcoholic.
"After years of being called a lush by his worried family, he finally checked himself into rehab."
In plain English: A lush is an alcoholic person who drinks heavily and often gets drunk easily.
"The lush felt soft and comfortable against my skin."
To drink (liquor) to excess.
"The partygoers went on a lush all night long, stumbling out of the club at dawn."
In plain English: To lush means to grow thick and green, but as a verb it usually refers to spending money recklessly on fun things instead of saving them.
"After years of neglect, the overgrown field finally began to lush again."
Juicy, succulent.
"The gardener watered the plants to make them look juicy and succulent rather than dry and brown."
A surname.
"Mr. Lush joined the committee to review the garden's budget."
The word lush originally meant "slack" or "limp" in Old English before evolving to describe something rich and abundant. It traveled into modern usage through Middle English while retaining its Germanic roots related to weakness.